This clip explains the mechanism clearly,

來源: -worldance- 於 2020-02-21 19:13:11 [] [舊帖] [給我悄悄話] 閱讀數 : (280 bytes)

though some of epidemiological data were not updated.

 

所有跟帖： 

• Very informative! -Uusequery- ♀ 給 Uusequery 發送悄悄話 (0 bytes) () 02/21/2020 postreply 20:38:51

請您先登陸，再發跟帖！